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channels: add ssh_channel_request_send_break to support RFC 4335

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Signed-off-by: Axel Eppe <aeppe@google.com>
Reviewed-by: Andreas Schneider <asn@cryptomilk.org>
This commit is contained in:
Axel Eppe
2018-04-06 13:41:39 +01:00
committed by Andreas Schneider
parent 6026fc8036
commit fb2fefb3c6
2 changed files with 50 additions and 0 deletions
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1
include/libssh/libssh.h
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@@ -418,6 +418,7 @@ LIBSSH_API int ssh_channel_request_pty_size(ssh_channel channel, const char *ter
int cols, int rows);
LIBSSH_API int ssh_channel_request_shell(ssh_channel channel);
LIBSSH_API int ssh_channel_request_send_signal(ssh_channel channel, const char *signum);
LIBSSH_API int ssh_channel_request_send_break(ssh_channel channel, uint32_t length);
LIBSSH_API int ssh_channel_request_sftp(ssh_channel channel);
LIBSSH_API int ssh_channel_request_subsystem(ssh_channel channel, const char *subsystem);
LIBSSH_API int ssh_channel_request_x11(ssh_channel channel, int single_connection, const char *protocol,

49
src/channels.c
View File

@@ -2528,6 +2528,55 @@ error:
}
/**
* @brief Send a break signal to the server (as described in RFC 4335).
*
* Sends a break signal to the remote process.
* Note, that remote system may not support breaks.
* In such a case this request will be silently ignored.
* Only SSH-v2 is supported.
*
* @param[in] channel The channel to send the break to.
*
* @param[in] length The break-length in milliseconds to send.
*
* @return SSH_OK on success, SSH_ERROR if an error occurred
* (including attempts to send signal via SSH-v1 session).
*/
int ssh_channel_request_send_break(ssh_channel channel, uint32_t length) {
ssh_buffer buffer = NULL;
int rc = SSH_ERROR;
if (channel == NULL) {
return SSH_ERROR;
}
#ifdef WITH_SSH1
if (channel->version == 1) {
return SSH_ERROR;
}
#endif
buffer = ssh_buffer_new();
if (buffer == NULL) {
ssh_set_error_oom(channel->session);
goto error;
}
rc = ssh_buffer_pack(buffer, "d", length);
if (rc != SSH_OK) {
ssh_set_error_oom(channel->session);
goto error;
}
rc = channel_request(channel, "break", buffer, 0);
error:
ssh_buffer_free(buffer);
return rc;
}
/**
* @brief Read data from a channel into a buffer.
*